We stayed here for one month. The building is nice and the people working there are very kind, helpful and always smiling - their friendliness really made the place feel welcoming. We appreciated the free weekly cleaning and we liked using the little mini gym.
The neighborhood was nice and felt totally safe walking around at all hours. Except that there are no sidewalks and the street is quite busy, so it is a bit scary walking to the metro, but we got used to it after a while and I suppose it is probably the same in most neighborhoods. I recommend going for walks or jogs around Suan Phlu park - it is even closer than Lumphini and has a great vibe, many locals hanging out and jogging at sunset.
The apartment itself is very small and there is no window in the kitchen. We were using the kitchen as our office to work on our laptops and it felt pretty cramped especially without a window. But the AC and Wifi worked perfectly, even for streaming videos. The stove was different than in the photo - only a one-burner hot plate, but it worked ok. The table was a little bigger than the one in the picture, which was nice for us because we could both work on our laptops there. The rice-cooker was great. The shower was always jumping quickly between hot and cold.

We used the AC in the afternoons, had our laptops and the refrigerator plugged in all the time and used the hot plate every day- our electricity bill for the month was around 35usd.